#define  _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
int main()
{
	char grade;
	scanf("%c", &grade);
	printf("Your score:");
	switch (grade)
	{
	case 'A':printf("85~100\n"); break;
	case 'B':printf("70~84\n"); break;
	case 'C':printf("60~69\n"); break;
	case 'D':printf("<60\n"); break;
	default:printf("enter data error!\n");
	}
	return 0;
}